The category id of pipe curves. It will be OST_PipeCurves, OST_FlexPipeCurves, or OST_PlaceHolderPipes.
Namespace: Autodesk.Revit.DB.Plumbing
Assembly: RevitAPI (in RevitAPI.dll) Version: 26.4.0.0 (26.4.0.0)
Syntax
C#
public ElementId CategoryId { get; }